我们需要注意的是注解和注解修饰的类，方法，属性、是连在一起的，当我们引用使用注解修饰的类，我们也使用了注解
@componentscan（value = {"包一"，“包二”……}） 这个表明需要扫描的包
@Configuration（value = “S”）如下所示，表明默认值为当前类，表明讲当前类作为一个配置类
public @interface Configuration { /** * Explicitly specify the name of the Spring bean definition associated with the * {@code @Configuration} class. If left unspecified (the common case), a bean * name will be automatically generated. * <p>The custom name applies only if the {@code @Configuration} class is picked * up via component scanning or supplied directly to an * {@link AnnotationConfigApplicationContext}. If the {@code @Configuration} class * is registered as a traditional XML bean definition, the name/id of the bean * element will take precedence. * @return the explicit component name, if any (or empty String otherwise) * @see AnnotationBeanNameGenerator */ @AliasFor(annotation = Component.class) String value() default "";
@Bean 修饰方法 将当前方法交给spring容器保管
@Bean(value = "runner") public QueryRunner CreateQueryRunner(DataSource dataSource){//大红线表明容器中没有datasource这个对象 return new QueryRunner(dataSource); } @Bean(value = "dataSource")//在容器中生成了datasource对象 public DataSource CreateDataSoerce(){ ComboPooledDataSource dataSource = new ComboPooledDataSource(); try { dataSource.setDriverClass("com.mysql.cj.jdbc.Driver"); dataSource.setJdbcUrl("jdbc:mysql://localhost:3306/mydatabase"); dataSource.setUser("root"); dataSource.setPassword("123456"); return dataSource; } catch (PropertyVetoException e) { throw new RuntimeException(e); }
@PropertySource(classpath:"文件路徑")
原文：https://www.cnblogs.com/guosai1500581464/p/13360777.html